1. Actĭus, a, um, adj. poet. for Actiacus, pertaining to Actium: ludi, Verg. A. 3, 280; 8, 675; 704; Hor. Ep. 1, 18, 61; Phoebus, as having a temple at Actium (v. Actium), Prop. 4, 6, 67.